Carnot engine operating between temperature T1andT2 are efficiency 16.WhenT2 is lowered by 62 K its efficiency increases to 13 .Then T1andT2 are , respectively
Efficiency of Carnot engine is given by
η1=1−T2T1
16=1−T2T1
T2T1=56.........(1)
When T2 is lowered by 62K its efficiency increases to 1/3
So,
η2=1−T2−62T1
13=1−T2−62T1
2T1−3T2+186............(2)
Solving equation (1) and (2)
T1=372K
T2=310K